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  <title>Start buffering Phar write operations, do not modify the Phar object on disk</title>

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</div><hr /><div id="phar.startbuffering" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">Phar::startBuffering</h1>
  <p class="verinfo">(PHP &gt;= 5.3.0, PECL phar &gt;= 1.0.0)</p><p class="refpurpose"><span class="refname">Phar::startBuffering</span> &mdash; <span class="dc-title">Start buffering Phar write operations, do not modify the Phar object on disk</span></p>

 </div>
 <div class="refsect1 description" id="refsect1-phar.startbuffering-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="modifier">public</span> <span class="type"><span class="type void">void</span></span> <span class="methodname"><strong>Phar::startBuffering</strong></span>
    ( <span class="methodparam">void</span>
   )</div>


  <p class="para rdfs-comment">
   Although technically unnecessary, the <span class="function"><strong>Phar::startBuffering()</strong></span> method
   can provide a significant performance boost when creating or modifying a
   Phar archive with a large number of files.  Ordinarily, every time a file
   within a Phar archive is created or modified in any way, the entire Phar
   archive will be recreated with the changes.  In this way, the archive will
   be up-to-date with the activity performed on it.
  </p>
  <p class="para">
   However, this can be unnecessary when simply creating a new Phar archive,
   when it would make more sense to write the entire archive out at once.
   Similarly, it is often necessary to make a series of changes and to ensure
   that they all are possible before making any changes on disk, similar to the
   relational database concept of transactions.  the
   <span class="function"><strong>Phar::startBuffering()</strong></span>/<span class="function"><a href="phar.stopbuffering.html" class="function">Phar::stopBuffering()</a></span> pair
   of methods is provided for this purpose.
  </p>
  <p class="para">
   Phar write buffering is per-archive, buffering active for the
   <em>foo.phar</em> Phar archive does not affect changes
   to the <em>bar.phar</em> Phar archive.
  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-phar.startbuffering-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   没有返回值。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-phar.startbuffering-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-674">
    <p><strong>Example #1 A <span class="function"><strong>Phar::startBuffering()</strong></span> example</strong></p>
    <div class="example-contents"><p>
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br /></span><span style="color: #FF8000">//&nbsp;make&nbsp;sure&nbsp;it&nbsp;doesn't&nbsp;exist<br /></span><span style="color: #007700">@</span><span style="color: #0000BB">unlink</span><span style="color: #007700">(</span><span style="color: #DD0000">'brandnewphar.phar'</span><span style="color: #007700">);<br />try&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="color: #0000BB">$p&nbsp;</span><span style="color: #007700">=&nbsp;new&nbsp;</span><span style="color: #0000BB">Phar</span><span style="color: #007700">(</span><span style="color: #0000BB">dirname</span><span style="color: #007700">(</span><span style="color: #0000BB">__FILE__</span><span style="color: #007700">)&nbsp;.&nbsp;</span><span style="color: #DD0000">'/brandnewphar.phar'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">0</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'brandnewphar.phar'</span><span style="color: #007700">);<br />}&nbsp;catch&nbsp;(</span><span style="color: #0000BB">Exception&nbsp;$e</span><span style="color: #007700">)&nbsp;{<br />&nbsp;&nbsp;&nbsp;&nbsp;echo&nbsp;</span><span style="color: #DD0000">'Could&nbsp;not&nbsp;create&nbsp;phar:'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$e</span><span style="color: #007700">;<br />}<br />echo&nbsp;</span><span style="color: #DD0000">'The&nbsp;new&nbsp;phar&nbsp;has&nbsp;'&nbsp;</span><span style="color: #007700">.&nbsp;</span><span style="color: #0000BB">$p</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">count</span><span style="color: #007700">()&nbsp;.&nbsp;</span><span style="color: #DD0000">"&nbsp;entries\n"</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">startBuffering</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file.txt'</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #DD0000">'hi'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file2.txt'</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #DD0000">'there'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file2.txt'</span><span style="color: #007700">]-&gt;</span><span style="color: #0000BB">setCompressedGZ</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file3.txt'</span><span style="color: #007700">]&nbsp;=&nbsp;</span><span style="color: #DD0000">'babyface'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">[</span><span style="color: #DD0000">'file3.txt'</span><span style="color: #007700">]-&gt;</span><span style="color: #0000BB">setMetadata</span><span style="color: #007700">(</span><span style="color: #0000BB">42</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">setStub</span><span style="color: #007700">(</span><span style="color: #DD0000">"&lt;?php<br />function&nbsp;__autoload(</span><span style="color: #0000BB">$class</span><span style="color: #DD0000">)<br />{<br />&nbsp;&nbsp;&nbsp;&nbsp;include&nbsp;'phar://myphar.phar/'&nbsp;.&nbsp;str_replace('_',&nbsp;'/',&nbsp;</span><span style="color: #0000BB">$class</span><span style="color: #DD0000">)&nbsp;.&nbsp;'.php';<br />}<br />Phar::mapPhar('myphar.phar');<br />include&nbsp;'phar://myphar.phar/startup.php';<br />__HALT_COMPILER();"</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$p</span><span style="color: #007700">-&gt;</span><span style="color: #0000BB">stopBuffering</span><span style="color: #007700">();<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 seealso" id="refsect1-phar.startbuffering-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="phar.stopbuffering.html" class="function" rel="rdfs-seeAlso">Phar::stopBuffering()</a> - Stop buffering write requests to the Phar archive, and save changes to disk</span></li>
    <li class="member"><span class="function"><a href="phar.isbuffering.html" class="function" rel="rdfs-seeAlso">Phar::isBuffering()</a> - Used to determine whether Phar write operations are being buffered, or are flushing directly to disk</span></li>
   </ul>
  </p>
 </div>


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